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Sigma KEE - Network2G
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2G
2G (or 2-G) 是电二代行动通信技术的简称。 2G 通信网是在1991年由Radiolinja 在芬兰基于GSM 标准而商业般的创立(目前是 Elisa Oyj 一部分). 以通用封包无线服务(GPRS ), 2G 提供个理论上传输速率最高达 1 Mbit/s (实际上500 kbit/s)。 最一般的2G技术是建立于时分多址(TDMA)的 GSM, 最初从欧洲发起但被大部分北美以外的世界地区采用. 超过 60 GSM 营运商也将于2010年时使用在 450 MHz 频道(CDMA 450)。 (资料来自英语维基百科)
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cellular 行動網路
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